Experimental analysis of energy performance of a ventilated window for heat recovery under controlled conditions

Publication: Research - peer-reviewJournal article – Annual report year: 2011

NullPointerException

View graph of relations

A ventilated window in cold climates can be considered as a passive heat recovery system. This study carried out tests to determine the thermal transmittance of ventilated windows by using the Guarded Hot Box. By testing under defined boundary conditions, the investigation described the heat balance of the ventilated window and clarified the methodology for thermal performance evaluation. Comparison between windows with and without ventilation using the window-room-ventilation heat balance revealed that a ventilated window can potentially contribute to energy savings. In addition, it was found that a significant part of preheating occurred through the window frames, which positively influenced the heat recovery of the window but increased the heat loss. Results also showed that increasing air flow decreased the recovery efficiency until the point when the additional thermal transmittance introduced by the ventilation was higher than the effect of heat recovery. Accordingly, the use of the ventilated windows might be most suitable for window unit with low ventilation rates. The results correlated with theoretical calculations in standards and software. However, the concept of a window thermal transmittance (Uw) value is not applicable for energy performance evaluation of ventilated window and requires deeper analysis.
Original languageEnglish
JournalEnergy and Buildings
Publication date2011
Volume43
Journal number11
Pages3200-3207
ISSN0378-7788
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2

Keywords

  • Thermal measurements, Active facade, Guarded hot box, Ventilated window, Heat transfer
Download as:
Download as PDF
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
PDF
Download as HTML
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
HTML
Download as Word
Select render style:
APAAuthorCBEHarvardMLAStandardVancouverShortLong
Word

Download statistics

No data available

ID: 6406386